The New York Times investigation into national water quality and pollution regulation required a tremendous effort in reporting and data analysis. The project, titled “Toxic Waters,” was enhanced by the painstaking efforts of many in the newsroom, including journalist-developer Derek Willis, a member of NYT’s Interactive News Technology team.

He described how the Times produced its award-winning series to members of the Online News Association and Hacks & Hackers in Washington yesterday. The recording of his presentation is below.